* {
  margin: 0;
  padding: 0;
}
html,body {
  width: 100%;
  height: 100%;
}
#root {
  width: 100%;
  height: 100%;
}
.wrap {
  width: 100%;
  height: 100%;
  display: flex;
}
.left {
  width: 120px;
  height: 100%;
  overflow-y: auto;
  background: pink;
}
.right {
flex: 1;
height: 100%;
overflow-y: auto;
background: skyblue;
}
.right h4 {
  margin-left: 25px;
}
.childbox {
  display: flex;
  flex-wrap: wrap;
  margin-left: 25px;
}
.childbox > div {
  width: 30%;
}
.active {
   background: #ccc;
}
